Early development of monodactylus argenteus (monodactylidae) from coastal waters of central vietnam, identified with dna barcoding

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Abstract

Late embryonic and early larval development (until first feeding) of Monodactylus argenteus have been studied. The chronology of development and a detailed morphological description of the eggs, embryos, and early larvae are presented. The eggs of M. argenteus were obtained from ichthyoplankton catches from the coastal waters of Central Vietnam and incubated under laboratory conditions at a temperature of about 24°C. The taxonomic identification was performed using the molecular-genetic method of DNA barcoding based on gene cytochrome oxidase 1 subunit (COI) from mitochondrial DNA.

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About the authors

A. M. Shadrin

Moscow State University

Author for correspondence.
Email: shadrin-mail@mail.ru
Russian Federation, Moscow

A. V. Semenova

Moscow State University; Vavilov Institute of General Genetics, Russian Academy of Sciences

Email: shadrin-mail@mail.ru
Russian Federation, Moscow; Moscow

N. T. Hai Thanh

Coastal Branch, Joint Vietnam–Russia Tropical Science and Technology Research Center

Email: shadrin-mail@mail.ru
Viet Nam, Nha Trang

References

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2. Fig. 1. Map of Nha Trang Bay. Sampling areas: 1 – 12°16ʹ42ʺ N, 109°15ʹ04ʺ E; 2 – 12°14ʹ44ʺ N, 109°15ʹ36ʺ E; 3 – 12°11ʹ39ʺ N, 109°15ʹ04ʺ E; 4 – 12°09ʹ52ʺ N, 109°15ʹ22ʺ E.

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3. Fig. 2. Embryonic development of Monodactylus argenteus: a – mobile embryo, age ~6–7 hours before hatching (a.v.); b, c – visual differentiation of pectoral fin rudiments, increased motor activity of the embryo, ~1–2 hours a.v.; d – embryo before hatching, view of the head section and the surface of the yolk sac around it, maximum development of the hatching glands, < 1 hour a.v. Scale, mm: a–c (total ruler) – 0.25, d – 0.1.

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4. Fig. 3. Hatching and prelarval development of Monodactylus argenteus: a – embryo in the process of emerging from the egg membranes; b–d – prelarvae: b – TL 1.88 (1.75–2.05) mm, age 1–2 h post hatching (a.p.); the selective mean value of the absolute body length and the range of its variation for all the examined individuals of this age are given; c – TL 2.05–2.15 mm, ventral view, 3–4 h a.p.; d – TL 2.30–2.45 mm, 18–20 h a.p. Here and in the legends to Figs. 4, 5: for prelarvae aged 3–4 h a.p. and older, as well as for the larva, TL is given as the range of variation in 2–5 specimens of the corresponding age. Scale: 1 mm (a–b – common ruler).

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5. Fig. 4. Monodactylus argenteus prelarvae: a – TL 2.45–2.55 mm, age 33–36 h post hatching (h.a.); b – TL 2.49–2.54 mm, 47–53 h h.a.; c – another individual of approximately the same age, ventral view. Scale (total ruler): 1 mm.

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6. Fig. 5. Prelarval and larval development of Monodactylus argenteus: a – prelarva TL 2.53–2.66 mm, 63–68 h post hatching (h.p.); b – another prelarva of approximately the same age, ventral view; c – larva that has switched to mixed feeding, TL 2.54–2.65 mm, ~80 h h.p. Scale (total ruler): 1 mm.

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